Abstract The aim of this study was to record the changes in the Cafayate region, Northwestern Argentina, over the last 50 years (1969–2019), with a focus on fluvial and dune systems, together with human activity. The multi-temporal analysis of different kinds of remote sensor images and field surveys allowed us to establish that the final section of the Santa Maria River shows a meandering channel whose arrangement and morphology have substantially changed since 1969. The Santa Maria River has moved from a northern position in 1969 to the current location, giving rise to a shortening in the channel length from 11756 m to 8217 m, increasing its gradient from 0.10% (1969) to 0.14% (2019), with its sinuosity index falling from 2.85 to 2, although the lateral erosion of the channel and the meanders have remained very active. The floodplain supplies sands to feed the aeolian dynamics through a close cycle that favors the development of large dune fields, especially in the river stretches where there is transversal wind direction. Moreover, the changes in land use have negatively impacted on the fluvio-aeolian dynamics of the system.

中文翻译：

---

阿根廷西北部半干旱山谷的地貌动态和人类相互作用：卡法亚特洼地（萨尔塔省）

摘要 本研究的目的是记录过去 50 年（1969-2019 年）阿根廷西北部卡法亚特地区的变化，重点关注河流和沙丘系统以及人类活动。对不同类型的遥感图像和实地调查的多时相分析使我们能够确定，圣玛丽亚河的最后一段显示了一条蜿蜒的河道，自 1969 年以来，其排列和形态发生了重大变化。从 1969 年的北部位置到现在的位置，导致河道长度从 11756 m 缩短到 8217 m，坡度从 0.10%（1969 年）增加到 0.14%（2019 年），曲率指数从 2.85 下降到 2 ，尽管河道和曲流的侧蚀仍然非常活跃。漫滩提供沙子，通过一个有利于大型沙丘地发展的封闭循环来满足风成动力学，特别是在有横向风向的河流延伸。此外，土地利用的变化对系统的河-风动力学产生了负面影响。